Adjustable die-stock.



Patented my 3|, |900.

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rEA cULvEE, OE CLEVELAND, OHIo,Ass1cNoR To 'rr-1E BRoNsO-'WALTON COMPANY, OE SAME ELAOE.

ADJUSTABLE' ple-STOCK.

SPFICATION forming part ofA Letters Pate-nt No. 655,061, dated J' uly 31, 1900. Application filed June 12, 1899. Renewed Iannerylll, 1900. Serial No. 1,144. (No model.)

fo a/ZZ whom it may concern:

Be it known that I, IRA OLVER, a citizen of the United lStates, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Adjustable Die-St`ocks,of which the following is a full, clear,'and exact description, reference being had to the accompanying drawings.

The object of my invention is to provide an adjustable die-stock of such character and .construction that the oscillating ring which controls the movement of the dies may be firmly clamped in any desired position, but may when released be moved backward, so as to retract the dies, and then forward with certainty to some predetermined position, and

may when desired,but not otherwise,be moved The die-stock may be of the usual form-.

that is to say, it may have an outer cylinder a, an inner cylinder a', a plurality of connecting-webs a2, and radial guide-slots as for the dies F.

B indicates an oscillating cam-ring, so called because it has on its under side as many cams Z9 as there are dies F. It is rotatably mounted upon the body of the diestock and is secured 4thereon and guided in a rotary path by means of a circular ring C, which is fastened to the inner cylinder a by screws, and is provided with an external annular flange c, which overhangs an internal annular flange b on the ring B. The dies F have slots f in which the cams b engage, whereby said dies are moved radially inward or outward. So much of the device as is above described is old.

In the outer periphery of the cam-ring B is a shallow groove b2, in which lies aliexible clamping-wire D. One end of this wire is bent downward and inserted in a hole in an ear c on one ofthe handle-sockets E. The other end of this band is likewise turned down and inserted into a hole in a tighteninglever G. This lever has'at its outer end a lug g, which enters a shallow socket in the ear e and serves as the fulcrum for said' lever. A screw J, passing through the lever between said fulcrum and the hole in which theend of the wire is inserted, screws into said ear, and as it is screwed up "it tightens the clamping-wire D, whereby the cam-ring B is held immovable.

The cam-ring is provided with a handle b4 for turning it to cause the dies to move inwardly or outwardly. It is customary in operating devices of this kind to turn this ring until certain graduations upon the ring and upon the inner ring C are in alinement to indicate when the dies are in the proper position for operating upon pipes or rods of a certain size. For example, the two marks 1 1 upon the two rings are shown in alinement in Fig. l, and this indicates that the dies are set for cutting a thread upon one-inch pipe. Sometimes a lot of pipe or rods which are repgreater or less diameter than represented. In such a case the cam-ring B cannot. occupy a position which brings the two marks into alinement and be adapted to cut a good thread on the pipe. One learns by experiment exactly how far in the dies should be moved for each lot, and when once this is ascertained by experiment a stop is adjusted so that if the ring be moved away from this position for the purpose of withdrawing the dies aftera thread has been out it may with certainty be again returned to this position, wherebyit is adapted to cut a thread upon another like piece of pipe. A clamp for this purpose is "shown in the drawings and is indicated by I-I. It has a pair of jaws h h, which are adapted to engage with the clamping-wire and to be firmly clamped thereon by a screw h'. A stop arm h2, which forms a part of this stop-clamp, overhangs the cam-ring, whereby it may engage with a shoulder b5 on said ring. This resented to be of a certain diameter are of ICO shoulder, as shown,'is`formed by the inner end the clamping-wire and then turning backthe cam-ring by means of its handle.

It is desirable, however, that this backward move-l ment of the ringshall'not be suicient to entirelywithdraw the cams on the ring from the slots in the dies. To prevent this action,

a beveled` notchb is cut in the inner face of thecam-ring close to its edge. A spring-pawl K, which has a beveled end, is vertically mov# able in a socket in the die-stock body and is forced upward bya spring k. When thecam-l ring is moved backward far enough tok withdraw the die`s,.thev pawl enters the beveled notch and prevents further movement in that direction but it oiers no obstacle to the movement of the cam-ring in the opposite direction. Theny it' is desired towithdraw the dies, this spring-,pawl is moved downward by means of an outwardly-projecting arm lc. This permits the cam-ring to move farther, so that the notch b therein passes the said spring-pawl and to such a position that the cams move out of the slots in the dies, whereupon the dies may be withdrawn.

nHaving described my invention, I claiml. Ina diestock, the combination of the body, dies radially Y.movable therein, and a cam-ring rotatably mounted on said body and having cams for engaging the said dies, and having also a grooved periphery, with a clamping-wire which engages in said groove and is connected at one end to the body, and a tight! eningV device toI which the other end is connected, substantially as specified'.

2. In aY die-stock, the combination of `the body, dies radially movable therein, and a cam rotatably mounted on said body andlhavingcams for engaging the said dies, and having also a grooved periphery,with a clampingwire which engages in said groove and is con` nected at one end to the body, a lever fulcrumed to an ear on the body, a screw passing through the lever and screwing into said ear, one end of said clamping-wire being 'convbodydies radially movable therein, and a cam-ring rotatably mounted on said body and having camsiorengaging the said dies, and

having also a groovedperiphery, with a clamping-.wire which engages in' said groove and is connected at one end to the body, and a tightening device to which the other end is connected, a stop-clamp adj ustably fastened to said clamping- Wire and adapted to engage, l.with a` shoulder on said fcam-ring, substantially as specified. A

4:. In a die-stock, the combination of a body, radially-movable dies mounted therein, and a cam-ring rotatably'mounted on said body having cams for engagement with said dies, and having also a grooved periphery, with a clamping-wire having its ends turned down,one end being inserted in a hole in an ear on the body,

l a'tightening-lever'fulcrumed to said ear and having a hole in which the other end of said clamping-wire is inserted, and a screw passing through said lever between said hole and fulcrum and screwing into said ear, substantially as specified.

' 5. In a .die-stock, the combination of the body, radially-movable dies and a Vcam-ring rotatably mounted on the body and having cams for engagement with said dies, and having also a beveled notch, with a beveled springpawl mounted in the body and adapted to automatieally eu gage in said notch, substantially as specified.

6. In a die-stock, the combination of a body, radially-movable dies, and a cam-ring rotatably mounted on the body and having cams for engagement with said dies, and having also a beveled notch in its inner face, a vertically-movable springpawl mounted in the body beneath the ring, said pawl having a beveled upper end and an outwardly-.proj ecting operating-arm, substantially as specified.

In testimony whereof I hereunto'aftix my signature in the presence of two witnesses.

IRA CULVER.

Witnesses:

E. L. THURsToN, PHILIP E. KNoWLToN. 

